To provide a light emitting diode array device that can be joined stably to an external driving circuit through very simple joining work, and to provide a light emitting diode (LED) printer using the device.

In the light emitting diode array device, a plurality of light emitting diodes 10 are arranged on a high resistance substrate 1. The device is composed of individual electrodes 4 commonly connected to the light emitting diodes of the same group composed of N pieces light emitting diodes, and common electrodes 50 connected to prescribed light emitting diodes of different groups. The high resistance substrate 1 has a common electrode forming area C and an individual electrode forming area S on both sides of the arranging area L of the light emitting diodes. In the individual electrode forming area S, individual electrode-side connection pads 11 are formed as extended from the individual electrodes 4 and common electrode-side connection pads 12 connected to first common electrodes 5.